CN101969191B - Optical fiber blocking override-avoiding tripping system - Google Patents
Optical fiber blocking override-avoiding tripping system Download PDFInfo
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- CN101969191B CN101969191B CN201010525123.9A CN201010525123A CN101969191B CN 101969191 B CN101969191 B CN 101969191B CN 201010525123 A CN201010525123 A CN 201010525123A CN 101969191 B CN101969191 B CN 101969191B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an optical fiber blocking override-avoiding tripping system and a blocking signal processing method for realizing an override avoiding function. The system comprises two types of devices, the first type is microcomputer synthetic protective devices PA 61 with the override-avoiding tripping function, and the second type is override-avoiding optical fiber hubs SU20. Optical blocking signals are used for connection blocking among the microcomputer synthetic protective devices and between the microcomputer synthetic protective devices and the override-avoiding optical fiber hubs. The states of the signals comprise a normal working state and 1-10 levels of time delay blocking states. The states of the signals are distinguished according to different frequencies of the signals. The frequencies of the signals are generated by an FPGA (Field Programmable Gate Array), and the FPGA outputs blocking signals with different widths to a DSP (Digital Signal Processor) when the FPGA communicates with the DSP. The system can realize the override-avoiding tripping of an upper level power supply system and a lower level power supply system, and can also realize multi-point concentration. The override-avoiding tripping is realized by the mode of unified blocking signal sending.
Description
Technical field
The present invention is a kind of anti-overstep tripping system.In multistage electric power system, the feature especially short for underground power supply system power supply distance, guard interval is little, operational mode is changeable, utilizes optical fiber block signal, carries out effective current protection locking, prevent overstep tripping to entire section line road.
Background technology
At present; overstep tripping is prevented on ground; most protective relaying device utilizes optical-fiber longitudinal difference protection to realize; and for down-hole anti-overstep tripping; itself is little with the microcomputer protecting device of anti-function of bypassing the immediate leadership, and protective device is coordinate by pilot wire relays and bus differential protecting to realize anti-overstep tripping substantially.Because electric power system is not a static system, its operational mode can change, and under different operational modes, the priority level of each protecting platform in electrical network also can change.If just carry out simple unidirectional locking one to one to fixing interconnector, after operational mode changes, the inlet wire circuit of subordinate's circuit changes, and arranges, just effectively can not prevent overstep tripping if do not change locking; Some intelligent monitoring terminals adopts the mode of software merit rating, can the priority of deploy switch at ground monitoring platform, but as long as circuit operational mode changes, just must reset the priority to inductive switch, operate quite loaded down with trivial details.
Summary of the invention
For the deficiencies in the prior art; in order to thoroughly solve overstep tripping, the invention provides a set of optical fiber blocking override-avoiding tripping system, comprising two kinds of devices; be a computer integrated protection for band anti-overstep tripping function, another kind is anti-fibre concentrator of bypassing the immediate leadership.
The technical solution adopted for the present invention to solve the technical problems is: a kind of is the computer integrated protection measure and control device being with anti-overstep tripping function, model is PA61, comprise master control borad, power panel, display module, Infrared remote controller, it is characterized in that: outside intake input terminal, relay output end, RS485/CAN communication terminal, insulation resistance monitor input terminal and optical fiber locking input and output terminal are all integrated on master control borad; External analog amount input terminal is connected with master control borad by power panel; Display module is connected with master control borad by communication cable; Outside is opened and is connected with master control borad by display module into control button; Infrared remote controller is connected with master control borad by display module.
Above-mentioned computer integrated protection measure and control device, it is further characterized in that: described master control borad is made up of digital signal processor DSP, field programmable gate array unit F PGA, ferroelectric memory, sample circuit, relay, and relay contained by it is made up of protection divide-shut brake relay, latching relay, signal relay; Described power panel is made up of instrument transformer module and power module, and instrument transformer module is a kind of current-to-voltage converter module; Described display module is made up of into button, indicator light, LCD and infrared remote receiver active opening.
Above-mentioned computer integrated protection measure and control device, it is further characterised in that: described power panel, by the power taking of threephase potential transformer PT three-phase, is supplied to master control borad power supply and exports DC110V and DC24V; It also has the communicating circuit part be integrated on master control borad, can carry out distant place communication by the communication interface of Phototube Coupling.
Above-mentioned computer integrated protection measure and control device, it is further characterised in that: when circuit generation overcurrent protection, and protective device fault actions exports, and inner generation overcurrent block signal, exports in the mode of light signal, externally carry out locking use simultaneously.
Above-mentioned computer integrated protection measure and control device; it is further characterised in that: when protective device generation overcurrent protection receives outside overcurrent block signal simultaneously; the action of protective device delay fault exports; and process is re-started to input block signal; and again export in the mode of light signal, externally carry out locking.
Above-mentioned computer integrated protection measure and control device, it is further characterised in that: when protective device receives outside overcurrent block signal, and under switch is in gate-dividing state, just no longer to outgoing block signal.
Above-mentioned computer integrated protection measure and control device, it is further characterised in that: have no progeny in Fiber connection between protective device, the alarm signal actuating of relay outlet of device.
Another kind is anti-fibre concentrator of bypassing the immediate leadership, and model is SU20, comprises master control borad, power panel.
Above-mentioned fibre concentrator, it is further characterized in that: described master control borad is made up of field programmable gate array unit F PGA, LED light, dial switch and relay, and relay contained by it is made up of alarm relay, tripping operation blocking relay; Described power panel is power module composition.
Above-mentioned fibre concentrator, it is further characterised in that: field programmable gate array unit F PGA exports, again for the locking of higher level supply line switch after can re-starting process to all input locking light signals gathered.
Above-mentioned fibre concentrator, it is further characterised in that: the block signal of output comprises light signal---for locking PA61 device; The signal of telecommunication---utilize the protective device of the mode locking other types opened into locking; And tripping operation blocking relay outlet signal---for the secondary trip loop of locking higher level supply line switch.
Above-mentioned fibre concentrator, it is further characterised in that: can judge Fiber connection, and when having no progeny in Fiber connection, the alarm relay action outlet of device, LED light is lighted simultaneously.
Above-mentioned fibre concentrator, it is further characterised in that: the dial switch on master control borad can carry out throwing to each locking input and move back control, avoiding device alarm by mistake.
Above-mentioned light block signal, it is further characterized in that: signal condition comprises " normal operating conditions ", " 1 ~ 10 grade of delay lock state ".
Above-mentioned light block signal, it is further characterized in that: the frequency different according to signal, carries out state differentiation to signal.
Above-mentioned light block signal, it is further characterized in that: the frequency of signal is generated by field programmable gate array unit F PGA, when field programmable gate array unit F PGA communicates with digital signal processor DSP, field programmable gate array unit F PGA exports the block signal of different in width to digital signal processor DSP.
beneficial effect of the present invention:
Computer integrated protection PA61 man-machine interface is friendly, provides full Chinese display interface and simple and direct visualized operation; Strong adaptability, has multi-protective function, is applicable to multiple primary equipment requirement; Can formation intelligent switchboard system supporting with Gao Bao switch cubicle producer, improve the technology content of switch cubicle itself, the competitive strength of enhancing switch cubicle; Integrated and the standardized product structure form of the height of pluralistic function, integrates the several functions such as protection, anti-overstep tripping, measurement, control, monitoring, communication, record ripple, logout.Fashionable appearance, volume is little, modularized design, easy to maintenance, reduces costs.
Anti-fibre concentrator SU20 low-profile of bypassing the immediate leadership, can be easily installed in high guarantor's switch cubicle, with PA61 with the use of, form comprehensive anti-overstep tripping system, self be furnished with electric locking signal in addition to export and the output of tripping operation blocking relay outlet signal, the tripping operation outlet of locking upper level supply line can be facilitated; Fiber connection indicator light, conveniently can check the situation of Fiber connection, working service is simple and convenient.
When over current fault appears in circuit, the protective device in all associated circuitry from bottom to up, sends block signal step by step, and the overcurrent protection of locking higher level circuit exports; Once after optical fiber locking connection establishment, how the operational mode regardless of electric power system changes, and how the priority regardless of supply line changes, and each protective device, without the need to again arranging, effectively can carry out locking, reach the object of anti-overstep tripping.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of computer integrated protection in the present invention.
Fig. 2 is the structured flowchart of anti-fibre concentrator of bypassing the immediate leadership in the present invention.
Fig. 3 is the wiring schematic diagram of the embodiment of the present invention.
Fig. 4 is another wiring schematic diagram of the embodiment of the present invention.
Embodiment
Technical scheme of the present invention is described further by specific embodiment below in conjunction with accompanying drawing.
Computer integrated protection PA61 is primarily of parts compositions such as mainboard (comprising digital signal processor DSP, field programmable gate array unit F PGA, ferroelectric memory, sample circuit, protection divide-shut brake relay, latching relay etc.), power panel (comprising power module, current-to-voltage converter module, amplifier module etc.), display module and Infrared remote controller.
As shown in Figure 1, be the structured flowchart of computer integrated protection PA61 in the present invention or utility model.
Voltage and current signal after the conversion of electrical network primary equipment voltage, current transformer is transformed into weak electric signal through microcomputer protecting device builtin voltage current transformer, be converted to digital quantity through multicircuit switch, operational amplifier, A/D converter, then undertaken processing by digital signal processor DSP, computing obtains corresponding electric current and voltage value; Simultaneously digital signal processor DSP accepts to open into button signal through the pulse signal of Phototube Coupling and On-off signal signal (as circuit-breaker status), outside; All signals are after calculation process, and send corresponding breaker tripping and closing signal and alarm signal to driving interface circuit, these signals are delivered to each relay by drive circuit, and breaker tripping and closing relay contact connects the closing loop of contactor.The measured value of various signal, protection act value, fixed value adjusting are all shown by LCD.
Can distant place communication be carried out by the communication interface of Phototube Coupling, remote measurement, remote signalling, remote control, remote regulating function can be realized, and the distant place that can realize definite value adjust and inquire about, Remote protection throws and the function such as to move back.
By the block signal that optical fiber interface inputs, after field programmable gate array unit F PGA process, send to digital signal processor DSP, delay lock trip operation is carried out to microcomputer protecting device; If line switching is in "on" position, the block signal of field programmable gate array unit F PGA process exports through optical fiber locking interface, accesses in other PA61 or SU20 devices; If line switching is in gate-dividing state, optical fiber block signal no longer externally exports.
Anti-fibre concentrator of bypassing the immediate leadership, model is SU20, comprises master control borad, power panel.
As shown in Figure 2, be the structured flowchart of the fibre concentrator SU20 that bypasses the immediate leadership anti-in the present invention or utility model.
SU20 receive all PA61 provide optical fiber locking believe after, through field programmable gate array unit F PGA process, then export PA61 to from the fiber outlet of SU20, lock operation carried out to it.
A kind of block signal processing method realizing anti-function of bypassing the immediate leadership, set up optical fiber blocking override-avoiding tripping system, it comprises two kinds of devices, a kind of is the computer integrated protection PA61 of above-mentioned band anti-overstep tripping function, a kind of is the above-mentioned anti-fibre concentrator SU20 that bypasses the immediate leadership, between described computer integrated protection, described computer integrated protection and anti-bypassing the immediate leadership between fibre concentrator all adopt light block signal to carry out connection locking; Signal condition comprises " normal operating conditions ", " 1 ~ 10 grade of delay lock state "; The frequency different according to signal, carries out state differentiation to signal; The frequency of signal is generated by field programmable gate array unit F PGA, when field programmable gate array unit F PGA communicates with digital signal processor DSP, field programmable gate array unit F PGA exports the block signal of different in width to digital signal processor DSP; Its step is:
Step one: subordinate's microcomputer protecting device superior microcomputer protecting device or fibre concentrator send light block signal;
Step 2: when normally working, utilizes field programmable gate array unit F PGA to process block signal, and the signal frequency of output is 1MHz; When there is over current fault, after the PA61 of the bottom detects fault, the light block signal that it sends is by two divided-frequency and 500KHz, export in upper level switch P A61 protection, this block signal, again by two divided-frequency and 250KHz, exports in upper level switch P A61 protection again, the like; Switch limit priority is 10 grades; Block signal at most by frequency division to 1KHZ;
Step 3: the frequency that field programmable gate array unit F PGA is different according to input light block signal, exports the block signal of different in width to digital signal processor DSP;
Step 4: for fibre concentrator SU20, field programmable gate array unit F PGA collects the highest signal of frequency, and externally exports.
In the invention, the design of block signal comprises algorithm design, Software for Design, hardware designs part.
1, algorithm design: in the invention, the core algorithm of block signal is the process of encoding to this signal.
(1) bottom PA61 device sends light block signal to upper level PA61 device or SU20.
(2) when normally working, utilize field programmable gate array unit F PGA to process block signal, the signal frequency of output is 1MHz; When there is over current fault, after the PA61 of the bottom detects fault, the light block signal that it sends is by two divided-frequency and 500KHz, export in upper level switch P A61 protection, this block signal, again by two divided-frequency and 250KHz, exports in upper level switch P A61 protection again, the like; Switch limit priority is 10 grades; Block signal at most by frequency division to 1KHZ.
(3) frequency that field programmable gate array unit F PGA is different according to input light block signal, exports the block signal of different in width to digital signal processor DSP.
(4) for SU20, the signal of field programmable gate array unit F PGA to different frequency compares process, the signal that external output frequency is the highest.
When there is over current fault in circuit; through above step; protective device in all associated circuitry from bottom to up; send block signal step by step to higher level's line protective devices; higher level's circuit progression is higher; it is longer that field programmable gate array unit F PGA exports to digital signal processor DSP tripping operation the locking time delay controlled, and thoroughly solves traditional protection overstep tripping phenomenon.
2, Software for Design: in the invention, block signal process is divided on software: signal generating routine, signal frequency split program and signal are to digital signal processor DSP delay lock output program.
Signal generating routine: when normally working, the external transmission frequency of field programmable gate array unit F PGA is the light signal of 1MHz; After breaking down, the digital signal processor DSP of faulty line device sends high level signal to field programmable gate array unit F PGA.
Signal frequency split program: field programmable gate array unit F PGA processes the signal that digital signal processor DSP transmits, outwards after transmission frequency division, frequency is the light signal of 500KHz; If field programmable gate array unit F PGA receives exterior light block signal simultaneously, select the light signal that frequency is the highest, scaling down processing is carried out to it, more outwards forwards.
Signal is to digital signal processor DSP delay lock output program: the frequency different according to the light block signal received, and field programmable gate array unit F PGA exports the block signal of different in width to digital signal processor DSP.
3, hardware designs: in the invention, block signal process comprises input-output optical fiber port, field programmable gate array unit F PGA, digital signal processor DSP.Field programmable gate array unit F PGA is the core module of block signal process, the reception of complete pair signals, frequency division and transmission etc.
If the present invention only bypasses the immediate leadership for upper and lower two-stage electric power system is anti-, only need respectively to configure a PA61 at circuit two ends, subordinate's route protection sends light block signal to higher level's route protection, realizes anti-overstep tripping.As shown in Figure 3.
The present invention is if multilevel system, when many inlet wires, many segmentations, multiple supply power mode are variable, every bar circuit need configure a PA61, every section of bus configures a SU20, a SU20 is configured between multiple block switches of service entrance switch and direct correlation thereof, block signal sent out by subordinate's Switch Controller associated fragment switch, and send out block signal mutually between associated fragment, subordinate's switch and associated fragment Switch Controller service entrance switch send out block signal.Employing multiple spot is concentrated, and the unified mode sending block signal realizes anti-overstep tripping.As shown in Figure 4.
Although the present invention is with preferred embodiment openly as above, they are not for limiting the present invention, anyly haveing the knack of this those skilled in the art, without departing from the spirit and scope of the invention, from when making various changes or retouch, but same within protection scope of the present invention.What therefore protection scope of the present invention should define with the claims of the application is as the criterion.
Claims (4)
1. the computer integrated protection with anti-overstep tripping function, comprise master control borad, power panel, display module and Infrared remote controller, it is characterized in that: outside intake input terminal, relay output end, RS485/CAN communication terminal, insulation resistance monitor input terminal and optical fiber locking input and output terminal are all integrated on master control borad; External analog amount input terminal is connected with master control borad by power panel; Display module is connected with master control borad by communication cable; Outside is opened and is connected with master control borad by display module into control button; Infrared remote controller is connected with master control borad by display module;
When circuit generation overcurrent protection, protective device produces fault actions outlet, and inner generation overcurrent block signal, exports in the mode of light signal, externally carry out locking use simultaneously; When protective device generation overcurrent protection receives outside overcurrent block signal simultaneously, protective device produces delay fault action outlet, and re-starts coding to input block signal, exports equally, externally carry out locking in the mode of light signal; When protective device receives outside overcurrent block signal, and under switch is in gate-dividing state, just no longer to outgoing block signal; Have no progeny in Fiber connection between protective device, the alarm relay of device produces action outlet.
2. an anti-fibre concentrator of bypassing the immediate leadership, comprises master control borad, power panel, it is characterized in that: described master control borad is made up of field programmable gate array unit F PGA, LED light, dial switch, alarm relay and tripping operation blocking relay; Power panel is made up of power module; Described field programmable gate array unit F PGA exports, again for the locking of higher level supply line switch after can re-starting process to all input locking light signals gathered; The block signal exported comprises light signal, for the computer integrated protection of locking band anti-overstep tripping according to claim 1 function; The signal of telecommunication, utilizes the protective device of the mode locking other types opened into locking; Tripping operation blocking relay outlet signal, for the secondary trip loop of locking higher level supply line switch;
Judge Fiber connection, when having no progeny in Fiber connection, described alarm relay produces action outlet, and LED light is lighted simultaneously; Dial switch on master control borad carries out throwing to each locking input and moves back control, avoids alarm relay alarm by mistake.
3. an optical fiber blocking override-avoiding tripping system, comprise two kinds of devices, the computer integrated protection of band anti-overstep tripping function according to claim 1, anti-fibre concentrator of bypassing the immediate leadership according to claim 2, it is characterized in that: between described computer integrated protection, described computer integrated protection and anti-bypassing the immediate leadership between fibre concentrator all adopt light block signal to carry out connection locking; Signal condition comprises " normal operating conditions ", " 1 ~ n level delay lock state "; The frequency different according to signal, carries out state differentiation to signal; The frequency of signal is generated by field programmable gate array unit F PGA, when field programmable gate array unit F PGA communicates with digital signal processor DSP, field programmable gate array unit F PGA exports the block signal of different in width to digital signal processor DSP.
4. realize a block signal processing method for anti-function of bypassing the immediate leadership, its step is:
Step one: subordinate's microcomputer protecting device superior microcomputer protecting device or fibre concentrator send light block signal; Step 2: when normally working, utilizes field programmable gate array unit F PGA to process block signal, and the signal frequency of output is a certain set point; When there is over current fault, the light block signal that the microcomputer protecting device of the bottom sends is by two divided-frequency, and export in upper level switch protected by microcomputer protecting equipment, described smooth block signal is again by two divided-frequency, export to again in upper level switch protected by microcomputer protecting equipment, the like;
Step 3: the frequency that field programmable gate array unit F PGA is different according to input light block signal, exports the block signal of different in width to digital signal processor DSP;
Step 4: for fibre concentrator, the signal of field programmable gate array unit F PGA to different frequency compares process, the signal that external output frequency is the highest.
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| CN201010525123.9A CN101969191B (en) | 2010-10-29 | 2010-10-29 | Optical fiber blocking override-avoiding tripping system |
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| CN201010525123.9A CN101969191B (en) | 2010-10-29 | 2010-10-29 | Optical fiber blocking override-avoiding tripping system |
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| CN101969191B true CN101969191B (en) | 2015-03-11 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306928B (en) * | 2011-09-19 | 2014-07-16 | 中国矿业大学 | Mining fiber longitudinal override trip protection device and method thereof |
| CN102723701A (en) * | 2012-06-20 | 2012-10-10 | 湖州电力局 | Remote optical signal locking protection device |
| CN105406451A (en) * | 2015-12-22 | 2016-03-16 | 西安西瑞控制技术股份有限公司 | Distributive region protection method, protection device and short circuit region protection system |
| CN106505529A (en) * | 2016-11-09 | 2017-03-15 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of intelligent substation low-voltage bus bar guard method |
| CN106652571B (en) * | 2017-02-24 | 2023-03-31 | 四川九洲空管科技有限责任公司 | Locking device and method for airborne collision avoidance system |
| CN107147090B (en) * | 2017-06-07 | 2021-06-01 | 广州地铁集团有限公司 | Bilateral united-hop device and bilateral united-hop protection system based on optical fiber communication |
| CN108649531B (en) * | 2018-05-10 | 2019-11-12 | 许继集团有限公司 | A kind of double loop acquisition tripping interface arrangement |
| CN110739667B (en) * | 2019-10-21 | 2022-04-26 | 许继电气股份有限公司 | Override trip prevention protection method and system |
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| JP2000059987A (en) * | 1998-06-01 | 2000-02-25 | Tokyo Electric Power Co Inc:The | Optical ct with failure judgement function |
| CN201266827Y (en) * | 2008-09-12 | 2009-07-01 | 南京因泰莱电器股份有限公司 | Microcomputer comprehensive protector for mining |
| CN201332264Y (en) * | 2009-01-05 | 2009-10-21 | 河南理工大学 | Chain safeguard intelligent control device for coal mine downhole power supply system |
| CN201829937U (en) * | 2010-10-29 | 2011-05-11 | 南京因泰莱电器股份有限公司 | Fiber-locking override-trip preventive system |
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| CN101969191A (en) | 2011-02-09 |
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